MiniFlake - Retro 1-Bit Dungeon Crawler (Help get this on Steam) :o)

miniFlake is a retro 1-bit mod-able rogue-like dungeon crawler, that is currently being developed for PC, Mac Vita and PS Vita by Wolfgang Wozniak and his wolfgame development team. The game is set in the SilverQuest universe with a black & white art style reminiscent of old D+D monster manuals and players handbooks while gameplay is influenced by pen and paper RPG's with dungeons being procedurally generated like the classic dungeon crawler Rogue.

The MiniFlake developers make it even more interesting with the numerous options that you can take to modify the game. Included with the game is a folder labelled xData which you can access, mod and add your own new content.
To quote the official site....."All art, music, items, enemies … everything is exposed outside of the
game, meaning anyone can add, remove or change anything in the game."

Here is an informative video of MiniFlake from Mike B (Indie for Breakfast).